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Finding the Fourth Proportional to 738.25, 1,105.32 and 478.55

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Solution

The fourth proportional to 738.25, 1,105.32 and 478.55 is: 716.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    738.25 : 1,105.32 = 478.55 : x
  2. Step 2: Convert to fraction form
    738.25/1,105.32 = 478.55/x
  3. Step 3: Cross multiply
    738.25x = 1,105.32 × 478.55
  4. Step 4: Simplify right side
    738.25x = 528,950.89
  5. Step 5: Solve for x
    x = 528,950.89/738.25
  6. Step 6: Final answer
    x = 716.49

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Double scale
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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.